Lack/Loss Of Power-Acceleration/Cruise [PYUL]: Outline

WARNING: This page is about a different variant/trim than selected.

LACK/LOSS OF POWER-ACCELERATION/CRUISE (PYUL) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item	Lack/Loss of power-acceleration/cruise
Description	Engine speed increase delays when the accelerator pedal is fully depressed.
Possible cause	NOTE: Even though the fuel gauge indicates the presence of sufficient fuel, the fuel is not transferred from the fuel tank (sub) to the fuel tank (main), which may cause fuel shortage and then engine stalling. The body control module (BCM) triggers the low fuel warning light to flash to alert the customer of the risk of engine stalling. Low fuel tank level PCM reprogramming not implemented Engine overheating Drive-by-wire control system operates with brake override system PCM detects DTCs PCM input signal error APP sensor or related wiring harness malfunction Communication error between TCM and PCM ECT sensor or related wiring harness malfunction Fuel pressure sensor or related wiring harness malfunction IAT sensor No. 1 or related wiring harness malfunction MAF sensor or related wiring harness malfunction MAP sensor or related wiring harness malfunction A/F sensor or related wiring harness malfunction HO2S or related wiring harness malfunction Improper operation of A/C system Improper operation of drive-by-wire control system Incorrect fuel injection timing Fuel injector malfunction Purge solenoid valve malfunction Fuel leakage Poor fuel quality Air leakage from intake-air system Intake-air system restriction Vacuum leakage Air cleaner restricted or dirty Brake dragging Tire pressure malfunction CKP sensor input signal malfunction Poor installation Damaged trigger wheel (crankshaft pulley) Open or short circuit in related wiring harness CMP sensor input signal error Poor installation Damaged trigger wheel (intake camshaft) Damaged trigger wheel (exhaust camshaft) Open or short circuit in related wiring harness Inadequate fuel pressure (high or low pressure side) Fuel pressure sensor malfunction High pressure fuel pump malfunction Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system) Spill valve control solenoid valve malfunction (built-into high pressure fuel pump) Relief valve (built-into high pressure fuel pump) malfunction Fuel line restriction Fuel filter clogged (built-into fuel pump unit) Fuel pump unit malfunction
Possible cause	Fuel system (low pressure) malfunction Battery voltage decrease Fuel pump unit malfunction Fuel filter (high-pressure) clogged (built-into fuel pump unit) Fuel filter (low-pressure) clogged (built-into fuel pump unit) Pressure regulator (built-into fuel pump unit) malfunction Jet pump (built-into fuel pump unit) malfunction Fuel tank malfunction Clogging in hose between fuel tank (main) and fuel tank (sub) Disconnected hose between fuel tank (main) and fuel tank (sub) Throttle body malfunction Throttle valve clogging Low engine compression Improper intake valve timing Improper exhaust valve timing Improper operation of electric variable valve timing control system Electric variable valve timing driver malfunction Electric variable valve timing motor malfunction Electric variable valve timing actuator malfunction Improper operation of hydraulic variable valve timing control system Spark plug malfunction Ignition coil malfunction Exhaust system and/or TWC restricted PCV valve malfunction Injector driver (built-into PCM) malfunction AT malfunction WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the [Fuel Line Safety Procedure] to prevent the fuel from spraying. (Refer to [ BEFORE SERVICE PRECAUTION ] in Service Information.) Fuel may cause irritation if it comes in contact with skin and eyes. If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities. Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. Always Refer to [ QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION (FUEL SYSTEM) ] before performing the fuel hose installation, and execute the [Fuel Leakage Inspection] after installation. (Refer to [ QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION ] in Service Information). (Refer to [ AFTER SERVICE PRECAUTION ] in Service Information.) CAUTION: Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.
Courtesy of MAZDA MOTORS CORP.
1	PCM
2	Spill valve control solenoid valve (High pressure fuel pump)